CN1289056A - Highly-compacted optical-fiber communication optical cable - Google Patents
Highly-compacted optical-fiber communication optical cable Download PDFInfo
- Publication number
- CN1289056A CN1289056A CN00126202A CN00126202A CN1289056A CN 1289056 A CN1289056 A CN 1289056A CN 00126202 A CN00126202 A CN 00126202A CN 00126202 A CN00126202 A CN 00126202A CN 1289056 A CN1289056 A CN 1289056A
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- China
- Prior art keywords
- separator tube
- optical cable
- mentioned
- shell
- bonding agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
Abstract
A cable having improved performance during temperature fluctuations includes an outer sheath with a central cavity that does not have a centrally located anchoring member. A plurality of buffer tubes are provided in the central cavity. At least one optical fiber is provided in each of the buffer tubes. The buffer tubes are coupled together to prevent slippage between the buffer tubes, thereby forming a core unit. An adhesive may be provided to couple together the buffer tubes. Alternatively, the buffer tubes may be fused together.
Description
The present invention relates generally to optical cable, more particularly, relate to one and have optical fiber is provided at separator tube wherein by loosely optical cable.Light (fibre) cable is used in for example telecommunication, to transmit sound, data, video and multimedia messages.
Many factors will be considered during the design optical cable, comprise lower cost and compact size.Compact optic cable design is important, so that obtain higher efficient (promptly having higher fiber count in less optical cable volume).Another kind of consideration is the characteristic of optical cable when optical cable is mounted the temperature variation of environment.Temperature variation causes that optical cable expands and contraction, and this will cause signal attenuation.Signal attenuation is a problem in the center cavity optic cable design especially.
Referring to Fig. 1, a center cavity optical cable 1 has a shell 2, wherein provides separator tube 3.Each separator tube 3 around a plurality of by the loose optical fiber that provides 5.Shell 2 and separator tube 3 are made by plastic material usually.These plastic materials have than the higher thermal expansivity of glass material of forming optical fiber 5.Therefore, when temperature change, shell 2 and separator tube 3 are tending towards more violent than optical fiber 5 distortion.The difference of this relative deformation causes separator tube 3 bendings, perhaps twists and warps under an extreme case, increases the loss of signal thus.
On the one hand, separator tube distortion is insignificant, because separator tube 3 is thin-walleds, and is light and handy with respect to optical fiber 2.In fact, for the compactedness of optical cable, with the least possible material separator tube 3 be desire.Therefore, optical fiber 5 is rigidity, is enough to resist and offset the relative more weak deformation force that the separator tube 3 by fragility is applied.In addition, separator tube 3 has free space, and optical fiber 5 can move therein.That is to say that optical fiber 5 is provided by loosely in separator tube 3.Therefore, the distortion of some separator tube can take place under the situation that does not influence optical fiber 5 wherein.
On the other hand, the distortion of shell more is a problem.Specifically, shell 2 is than separator tube 3 volumes huger (manufacturing materials of per unit length is more).Therefore, shell 2 sharply is out of shape because of heat fluctuation.In addition, casing deformation power is than 5 can resist much better than of optical fiber.
Consider a kind of situation, for example environment temperature drops to relatively lower temp shown in Fig. 2 (B) from the relative higher temperature shown in Fig. 2 (A).Fig. 2 (A) is illustrated in the optical cable 1 of a non-twist and warping state.At some point 10 along optical cable 1 length, the inside surface of shell 2 meshes with the outside surface of a separator tube 3 ' (" contacts separator tube ").
Forward among Fig. 2 (B), along with decrease of temperature, separator tube 3,3 ' meeting is 15 slight shrinkage (or distortion) along its length.But this rigidity that is punctured into optical fiber 5 is offset, and perhaps avoids together owing to the free space in the separator tube 3,3 '.Yet because its is bulky, shell 2 15 contractions along its length is more serious.Shell 2 is bulky also to produce sizable convergent force.In the friction engagement at contact point 10 places effectively combining with the convergent force that contacts separator tube 3 ' from shell 2.These shrink with the combination of contact force and have overcome the rigidity that contacts optical fiber 5 in the separator tube 3 '.Therefore, when contact point 10 (for example) moves right one when determining apart from d, the 3 ' bending of contact separator tube, and under an extreme condition, twist and warp.Finally, the internal diameter of contact separator tube 3 ' and 5 engagements of optical fiber wherein, and make its bending.It is this because the trickle bending of optical fiber/twist and warping phenomenon that the combination of contact force and friction force causes is being called as microbend in the art.Microbend increases the loss of signal.
By convention, two kinds of technology have been used and have overcome the microbend that is caused by the optical cable components thermal deformation.First kind of technology relates to the central authorities of bigger and more fixing element leading in cable center cavity.An example of Fig. 2 (C) expression one retaining element that is provided with placed in the middle, this is referred to as center intensity part 4 in the art.Separator tube 3 is stranded around center intensity part 4 when optical cable is made.In this way, center intensity part 4 is used for " fixing " separator tube 3.Center intensity part 4 is to be made by rigid material, and has very little deformation features.Therefore, center intensity part 4 provides antitorque curved power and has offset the shell contraction.Second kind of technology is the free space that optical cable 1 is designed to have increase, and in this space, separator tube 3 and optical fiber 5 are movably.The free space of this increase can partly be removed optical fiber 5 at an easy rate from the twist and warping of contact separator tube 3 '.
Although it is acceptable that these conventional arts are considered to usually, they have the shortcoming of design efficiency aspect.That is to say that these technology have increased the size of optical cable, and reduced the efficient (being the less fiber number of per unit optical cable volume) of optical cable thus.In addition, the fixture that is provided with placed in the middle has reduced the pliability of optical cable significantly, and this uses for some, just is a problem especially.
Therefore, the object of the present invention is to provide a kind of optic cable design of uniqueness, it has the performance of improvement in the whole temperature changing process of installation environment.More specifically be, the objective of the invention is to effectively to avoid the optical fiber micro-bending (with the related with it loss of signal) that causes by thermal deformation, and do not reduce the number of fibers of unit cable volume.
The invention belongs to the optical cable that has the shell that has a center cavity, a plurality of separator tubes are provided in center cavity.An optical fiber is provided in each separator tube at least.These separator tubes are connected in together, to prevent the slip between the separator tube.The separator tube that is linked together has the antitorque curved property of increase.According to an aspect of the present invention, by bonding agent separator tube is linked together.According to a further aspect in the invention, separator tube is fused together.
Comprise the above-mentioned and further feature of many novel structure details, more specifically describe now with reference to the content of pointing out in accompanying drawing and claims.It will be appreciated that implementing special optical cable of the present invention only is to illustrate by illustrating, and not as limitation of the present invention.Principle of the present invention and feature can be applied among different and the many embodiment without departing from the present invention.
Fig. 1 is the skeleton view of a center cavity optical cable;
The longitudinal cross-section of Fig. 2 (A) and 2 (B) expression optical cable shown in Figure 1;
Fig. 2 (C) expression comprises a center cavity optical cable of a fixture that is provided with placed in the middle;
Fig. 3 represents the xsect according to the optical cable of first embodiment of the invention;
Fig. 4 represents the xsect according to the optical cable of second embodiment of the invention;
The longitudinal cross-section of Fig. 5 (A) and 5 (B) expression optical cable shown in Figure 3; And
Fig. 6 represents to comprise the lateral cross of the optical cable shown in Figure 4 of other optical cable components.
Fig. 3 represents optical cable 21 according to an embodiment of the invention.This optical cable 21 has shell 22, and wherein separator tube 23 is provided.Each separator tube 23 is around many optical fiber 25 that provided by loosely.
Importantly, separator tube 23 is connected in together, to prevent the slip between the adjacent buffer pipe 23.In this respect, form the heart yearn unit 100 of an indivisible compactness by separator tube 23.Should be understood that the intensity of this connection is enough to provide antitorque curved property; But separator tube can easily separate for the light optical fiber cable termination of following discussion.Separator tube connects and can obtain by many means.For example, as shown in Figure 3, bonding agent 30 can be bonded together separator tube 23.Be decided by to use and production run, bonding agent 30 can be a kind of hot-melt adhesive or uv-curable bonding agent.These bonding agents are well-known in association area, and therefore identical just going through will no longer be provided.
The bond strength of bonding agent 30 is preferably less than the tear resistance of separator tube 23.Therefore, when choosing optical fiber 25 when (optical fiber connects for example to carry out), selecteed separator tube 23 just can successfully separate with heart yearn unit 100.
Should be understood that this optical cable 21 does not comprise the fixture that is arranged on cavity center.This feature helps providing for optic cable design of the present invention the optical cable efficient of improvement.That is to say that optic cable design of the present invention is compared with the number of fibers of the unit cable volume of conventional cable design, has the number of fibers of the unit cable volume of increase.
Fig. 4 represents the second embodiment of the present invention.Second embodiment has and those components identical as shown in Figure 3.Yet embodiment shown in Figure 4 does not use bonding agent that separator tube 23 is linked together.But separator tube 23 is fused together, to form heart yearn unit 100.
Fusion can be by heat, and the combination of chemistry or two kinds of methods realizes.For example, for heat fusion, separator tube 23 is heated to the melt temperature that exceeds them and is pressed together, so that the surface in contact of adjacent buffer pipe 23 becomes is bonded together.The heating of separator tube preferably just occurs in after the pressing steps, so that the heat fusion effect that realization is desireed.Except top heat fusion (perhaps as an alternative), chemical substance also can provide on separator tube, to realize chemistry fusion effect, i.e. chemical adhesion between the surface in contact of adjacent buffer pipe 23.
In the 3rd embodiment, optical cable 21 has and the first and second embodiment components identical.Yet the unpromising bonding agent of separator tube 23 (first embodiment) or melt bonded (second embodiment) are fixed together.But separator tube 23 has the outside surface of high friction.For example, outside surface can be veined.In addition, thread can contact with each other around separator tube 23 windings and them and be fixed together.The surface and the thread of high friction match, to stop the slip between the adjacent buffer pipe 23.Separator tube 23 and thread form heart yearn unit 100.
In the 4th embodiment, separator tube 23 is linked together with mechanical means.For example, a separator tube 23 can have one by the outside surface of being slotted, and the complementation shaping outside surface of itself and adjacent buffer pipe 23 meshes together.The shape (with the cooperation of intermeshing) that is decided by them, the outside surface groove of separator tube 23 can play the slip that stops between the adjacent separator tube, and separator tube 23 are fixed on together the effect in the heart yearn unit 100 of an ameristic compactness.In addition, the outside surface of fluting can with another coupling method, for example combining is provided for bonding agent (first embodiment) or melt bonded (second embodiment).
Advantageous effect of the present invention is existing to be described with reference to Fig. 5 (A) and Fig. 5 (B).Fig. 5 (A) expression is in the optical cable 21 under the relative higher temperature, and Fig. 5 (B) expression is in the optical cable 21 under the relatively lower temp.For the sake of clarity, Fig. 5 (A) and 5 (B) represent heart yearn unit 100 generally, and only represent one of them separator tube 23 and optical fiber 5 in detail.
Shown in Fig. 5 (A), point 200 exists along the length directions of optical cable 21, the inside surface of this some place shell 22 with shown in the outside surface friction engagement of separator tube 23 ' (" contacting separator tube ").
Turn to Fig. 5 (B), when temperature descends, separator tube 23,23 ' 15 contractions longitudinally (or distortion).But the rigidity that is punctured into optical fiber 5 of separator tube is offset, and perhaps avoids because of the free space in the separator tube 23,23 ' together.Shell 22 also longitudinally shrinks.Because its is bulky, so shell 22 contractions are even more serious and stressed bigger.Yet, the 100 not bending/twist and warping of heart yearn unit.But heart yearn unit 100 has enough antitorque curved property, to overcome the friction engagement at contact point 200 places.Therefore, at contact point 200, the outside surface that the inside surface of shell 22 strides across contact separator tube 23 ' slides.That is to say that the initial surface in contact 201 of shell 22 can move certain for d with respect to heart yearn unit 100.
This favourable slide effect is implemented, because heart yearn unit 100 has an antitorque curved property of comparing increase with the single separator tube 23 that does not connect.The antitorque curved property of this increase can be considered at least because following factor causes.At first, when separator tube 23 is connected in together, when making their surface not slide over each other, the transverse force that is applied by shell 22 is along all separator tubes 23,23 ' combined cross section zone diffusion, rather than only along the transverse cross-sectional area diffusion that contacts separator tube 23 '.Therefore, when same transverse force was applied in, 100 lateral deflections of heart yearn unit were less.The second, the rigidity of all optical fiber 25 (being not only the optical fiber in the contact separator tube 23 ') has been offset the transverse force that is applied for shell 22.
To be understood that the antitorque curved power of heart yearn unit 100 needs to increase, so that be enough to overcome the friction engagement at contact point 200 places between shell 22 and the contact separator tube 23 '.
Because the slide effect between contact point heart yearn unit 100,200 place and the shell 22, does not does not twist and warp heart yearn unit 100.The local sharply crooked or twist and warping at contact position place separator tube will be removed or significantly reduce to this effect.Therefore, contact separator tube 23 ' not with wherein optical fiber 5 engagement, and make fibre-optical bending/twist and warping.By this way, optic cable design of the present invention has significantly reduced little curved phenomenon (with the signal attenuation of the increase that is attached thereto), otherwise will take place because of temperature fluctuation.
In optic cable design of the present invention, traditional material can be used to make optical cable components.Traditional material includes but are not limited to: tygon, polypropylene, Polyvinylchloride, polyester, polyamide or top multipolymer or mixture of polymers.This material is well-known in association area, and therefore an identical detailed description will no longer provide.New material also can be prepared, to produce fusion between separator tube.The feature of this new material will comprise, but be not limited to reduce surface smoothness and reduce surface heat stability.
Certainly, other element also can be added in the optic cable design of the present invention.For example as shown in Figure 6, an armouring shell 26 that provides in the shell 22 can be provided optical cable 21, or the reinforcement in the shell 22 27.Optical cable 21 also can comprise yarn, adhesive tape and hydroexpansivity element.All these more optical cable components also are well-known in the art, and therefore identical detailed description will no longer provide.
Optical cable according to the present invention provides significant advantage.In other words, do not comprise the optical cable compactedness, optical cable of the present invention has the performance of enhancement when temperature variation.
Claims (15)
1. optical cable, it comprises:
One has the shell of a center cavity, and this center cavity does not have and is arranged on the mesotropic fixture in above-mentioned center;
A plurality of separator tubes that in above-mentioned center cavity, are provided; And
At least one optical fiber that in above-mentioned each separator tube, is provided,
Wherein above-mentioned separator tube is connected in together, to stop the slip between the above-mentioned separator tube.
2. according to the optical cable of claim 1, it further comprises:
The bonding agent that above-mentioned separator tube is linked together.
3. according to the optical cable of claim 2, wherein above-mentioned bonding agent is a hot-melt adhesive.
4. according to the optical cable of claim 2, wherein above-mentioned bonding agent is the bonding agent of a uv-curable.
5. according to the optical cable of claim 2, wherein the bond strength of above-mentioned bonding agent is less than the tear resistance of above-mentioned separator tube.
6. according to the optical cable of claim 1, wherein above-mentioned separator tube is fused together.
7. according to the optical cable of claim 1, it further comprises:
One is that be provided in above-mentioned shell and around the armouring shell of above-mentioned separator tube.
8. according to the optical cable of claim 1, wherein in each above-mentioned separator tube, above-mentioned at least one optical fiber is provided by loosely.
9. method of making optical cable, this method may further comprise the steps:
Location at least one optical fiber in a plurality of separator tubes each;
Separator tube is linked together, to stop the slip between the separator tube; And
One shell is provided on the separator tube that is linked together, makes the cavity of this shell not have the fixture that is arranged on these cavity central authorities.
10. according to the method for claim 9, wherein attachment step is included in bonding agent is provided on the separator tube, so that separator tube is linked together.
11. according to the method for claim 10, wherein this bonding agent is a hot-melt adhesive.
12. according to the method for claim 10, wherein this bonding agent is the bonding agent of a uv-curable.
13. according to the method for claim 10, wherein this bonding agent has the bond strength less than the separator tube tear resistance.
14. according to the method for claim 9, attachment step wherein comprises separator tube is fused together.
15. according to the method for claim 9, it further may further comprise the steps:
The one armouring shell around this separator tube is provided in this shell.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15224799P | 1999-09-03 | 1999-09-03 | |
| US60/152,247 | 1999-09-03 | ||
| US09/590,167 US6504980B1 (en) | 1999-09-03 | 2000-06-09 | Highly compact optical fiber communications cable |
| US09/590,167 | 2000-06-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1289056A true CN1289056A (en) | 2001-03-28 |
| CN1320381C CN1320381C (en) | 2007-06-06 |
Family
ID=26849383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001262025A Expired - Fee Related CN1320381C (en) | 1999-09-03 | 2000-08-28 | Highly-compacted optical-fiber communication optical cable |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6504980B1 (en) |
| EP (1) | EP1168023B1 (en) |
| CN (1) | CN1320381C (en) |
| AT (1) | ATE336734T1 (en) |
| DE (1) | DE60030098T2 (en) |
| ES (1) | ES2269064T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6930253B2 (en) | 2002-03-04 | 2005-08-16 | Samsung Electronics Co., Ltd. | Compact optical cable |
| CN103604382A (en) * | 2013-11-01 | 2014-02-26 | 河海大学 | Bellows-distributed optical fiber measuring sensor |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7421169B2 (en) * | 2003-06-20 | 2008-09-02 | Fujikura Ltd. | Optical fiber cable |
| US6973246B2 (en) | 2004-04-28 | 2005-12-06 | Furukawa Electric North America, Inc. | High count optical fiber cable |
| US7515795B2 (en) * | 2005-07-20 | 2009-04-07 | Draka Comteq B.V. | Water-swellable tape, adhesive-backed for coupling when used inside a buffer tube |
| US7599589B2 (en) * | 2005-07-20 | 2009-10-06 | Draka Comteq B.V. | Gel-free buffer tube with adhesively coupled optical element |
| US7567739B2 (en) * | 2007-01-31 | 2009-07-28 | Draka Comteq B.V. | Fiber optic cable having a water-swellable element |
| US8682123B2 (en) | 2010-07-15 | 2014-03-25 | Draka Comteq, B.V. | Adhesively coupled optical fibers and enclosing tape |
| US10809475B2 (en) | 2014-03-18 | 2020-10-20 | Corning Optical Communications LLC | Jacket for a fiber optic cable |
| WO2017160666A1 (en) | 2016-03-15 | 2017-09-21 | Commscope, Inc. Of North Carolina | Multi-member cable with improved mid-span access |
| AT518541B1 (en) * | 2016-05-09 | 2017-11-15 | Teufelberger Seil Ges M B H | steel cable |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57141606A (en) * | 1981-02-18 | 1982-09-02 | Furukawa Electric Co Ltd:The | Optical communication cable |
| US5013127A (en) * | 1990-04-26 | 1991-05-07 | Siecor Corporation | Flexible fiber optic distribution cable |
| FR2665266B1 (en) * | 1990-07-27 | 1993-07-30 | Silec Liaisons Elec | FIBER OPTIC TELECOMMUNICATION CABLE. |
| US5325457A (en) * | 1991-09-20 | 1994-06-28 | Bottoms Jack Jr | Field protected self-supporting fiber optic cable |
| US5224192A (en) * | 1992-04-13 | 1993-06-29 | Siecor Corporation | Cable with light waveguide tubes in a matrix |
| GB2271859B (en) | 1992-10-21 | 1995-10-18 | Northern Telecom Ltd | Optical fibre cable comprising stack of ribbon fibre elements |
| CN2171878Y (en) * | 1993-07-09 | 1994-07-13 | 深圳光通发展有限公司 | Pipe type light cable with multiple metal wire flat armoured centre bunch |
| US5425121A (en) * | 1994-02-02 | 1995-06-13 | Siecor Corporation | Cable assembly for use with opto-electronic equipment enclosures |
| FR2725041B1 (en) | 1994-09-23 | 1996-11-22 | Alcatel Cable | OPTICAL FIBER CABLE |
| DE19517118A1 (en) * | 1995-05-10 | 1996-11-14 | Siemens Ag | Optical fibre transmission element for optical or electrical cable |
| US5970196A (en) * | 1997-09-22 | 1999-10-19 | Siecor Corporation | Fiber optic protective member with removable section to facilitate separation thereof |
| JPH11142702A (en) * | 1997-11-13 | 1999-05-28 | Sumitomo Electric Ind Ltd | Optical cable and its laying method |
| US6226431B1 (en) * | 1999-06-29 | 2001-05-01 | Lucent Technology Inc. | Optical fiber cable |
| US6584251B1 (en) * | 2000-05-23 | 2003-06-24 | Alcatel | Solid stranding flextube unit |
-
2000
- 2000-06-09 US US09/590,167 patent/US6504980B1/en not_active Expired - Lifetime
- 2000-08-28 EP EP00202970A patent/EP1168023B1/en not_active Expired - Lifetime
- 2000-08-28 CN CNB001262025A patent/CN1320381C/en not_active Expired - Fee Related
- 2000-08-28 ES ES00202970T patent/ES2269064T3/en not_active Expired - Lifetime
- 2000-08-28 DE DE60030098T patent/DE60030098T2/en not_active Expired - Lifetime
- 2000-08-28 AT AT00202970T patent/ATE336734T1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6930253B2 (en) | 2002-03-04 | 2005-08-16 | Samsung Electronics Co., Ltd. | Compact optical cable |
| CN103604382A (en) * | 2013-11-01 | 2014-02-26 | 河海大学 | Bellows-distributed optical fiber measuring sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2269064T3 (en) | 2007-04-01 |
| DE60030098T2 (en) | 2007-02-15 |
| EP1168023A3 (en) | 2004-03-31 |
| US6504980B1 (en) | 2003-01-07 |
| EP1168023B1 (en) | 2006-08-16 |
| DE60030098D1 (en) | 2006-09-28 |
| ATE336734T1 (en) | 2006-09-15 |
| CN1320381C (en) | 2007-06-06 |
| EP1168023A2 (en) | 2002-01-02 |
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